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Marketable Securities and Fair Value Measurements - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |
Common stock warrants | $ 360,795 | $ 1,167,614 |
Change in the fair value | $ (807,000) | $ (134,000) | $ (722,000)
Number of warrants exercised (shares) | 0 | 0 |
First warrant |  |  |
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |
Change in the fair value | $ 0 | $ (6,000) | $ (544,000)
Significant Unobservable Inputs (Level 3) |  |  |
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |
Change in the fair value | $ (806,819) | (133,524) |
Significant Unobservable Inputs (Level 3) | Second warrant |  |  |
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |
Common stock warrants |  | $ 0 |

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- Definition Class of Warrant or Right, Number of Warrants Exercised + References No definition available. + Details
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- Definition Marketable securities and fair value measurements. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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